Safety-lock.



H. WEGMANN.

SAFETY LOOK. l APPLICATION FILED 11110.16, 1911.

Patented oet.15,'1912.

HEINRICH WEGMANN, 0F BOCHUM, GERMANY.

SAFETY-LOCK.

Loarsss.

Specification of Letters Patent.

Application filed December 16, 1911.

Patented Got. 15,1912.

Serial No. 666,113.

To ci? whom 'it may concern:

IBe it known that I, HEINRICH WEGMANN, a subject of the King of Prussia, of 7 Kronenstrasse, Bochum, in Westphalia, in the Kingdom of Prussia, Empire of Germany, chief machinist, have invented certain new and useful improvements in Safety-Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The security hitherto obtained by means of the simpler safety-locks commonly employed on the doors of houses, chambers, cup-boards and the like against professional burglary and theft is principally based upon the shape of key-bits, tubular keyshanks and upon the tumblers cooperating therewith, as it is for instance the case in the so called Chubb-locks, Brahmah-locks and so forth. But even these locks do not in the most cases oer unsurmountable obstacles to skilled burglars and like gentry, so that only the complicated and costly safety-locks usually used on safes and tills must be considered as oering the desired security, but

as their iirst-cost is very high, they cannot come under consideration for common use.

To obviate these drawbacks is the object of my present invention, which is obtained by employing two or more bolts crossing and checking each other in a manner to be moved into or retracted from their several locking-positions in turns during the same rotation of a key having two bits adapted to turn around a common axis in opposite directions until they occupy a given angular position with respect to each other. By means of these simple arrangements it is made possible to obtain perfect security against an unlawful opening of any door etc. provided with this invention, since even in the case, when a key adapted to operate one of the bolts should be introduced into the lock, the latter could not -be opened, since an auxiliary bolt or a group of bolts would still retain their position and prevent the retraction of the first bolt. To still further increase the security thus 0btained the key is constructed in such a manner that the two bitsor webs can be separated or spread to the desired angle after the key has been inserted into the lock. This peculiarity makes it possible to give the keyhole in the lock-casing, or in the escutcheon usually secured upon the door, one of the usual shapes, so as not to betray by any visible signs that the lock can only be opened by a key with two bits, or to indicate the angle under which such key-bits have to be arranged one to another.

In the accompanying drawing my invention is explained as applied to a chamberdoor mortise-lock, wherein Figure 1 is a plan-view of the lock at the beginning of the withdrawal of the deadbolt, the lock-cover being removed. Fig. 2 is a rear-elevation of the lock. Fig. 3 is a view similar to the one shown in Fig. l, showing the movable parts at the beginning of the second turn of the main dead-bolt and at the first turn of the auxiliary bolt. Fig. t is an elevation o-f the collapsible or compound key on a larger scale. Fig. 5 is an end-view of the key. Fig. 6 is a sectional view taken on line A-B of Fig. fi, showing the two bits in their opened or working position.

rhe latch-bolt a of the mortise-lock b is in the usual manner thrown forward by means of the spring c and retracted by the aid of the handle d. The nut e carries a finger f which engages the latch-tail g during the retraction of the latch-bolt. Below the latter the main dead-bolt h is arranged and guided in the usual manner. In the end-positions this dead-bolt is secured by the .tumbler j which stands under the influence of the spring z'. Behind the main dead-bolt the-auxiliary dead-bolt or slide 7c 4is arranged, and guided in the usual manner by means of a slot and pin. In both end-positions this bolt is securely held by means ofthe tumbler m which is continuously acted upon by the spring Z. When the door has been locked the upper end of the auxiliary dead-bolt 7c takes up a position behind the latch-tail g, so that the latch cannot be moved back or forth, and thus besides serving as a latch it also serves as a dead-bolt.

The key-hole n shows in the present embodiment of my invention a very simple shape, through which the compound key 0 is pushed with closed bitsjFig. 5) and then opened by means of its two part handle (Fig. 6). This is made possible since the bit q forms a part of the tubelike part of the keyshaft, whereas the bit p which faces bit g is attached to the cylindrical central part of the key-shaft. The bit p is thus adapted to swing within the aperture rof the tubelike part of the key-shaft until both Vkey-bits have been spread sufficiently to f the dead-bolt L, as indicated in Fig. 3. On

continuing the rotation of the key the tooth 79 of the bit 79 will disengage the tumbler m from Vthe auxiliary dead-bolt l: and simulta- `neously therewith the tooth y2 will enter the lower notch of the auxiliary bolt 7u to draw the latter downward. In the meantime-the bolt la has been so far retracted that the bend or curved portion of a slot t with which said bolt is provided is engaged by a pines of bolt 7c. Through this curved portion of the slot the pin s will gradually advance toward the vertical part of said slot and enter into it as soon as the middle tooth g has fully retracted the dead-bolt 7L and the tumbler j has locked the latter again, Vwhich takes place when the tooth 79 leaves the lower notch of the auxiliary dead-boltc. In the meantime the tooth Q" has engaged the tumbler m and the tooth g has entered into the upper notch of the auxiliary dead-bolt 7c, which bolt will have been drawn fully downward when the tooth g is about to. leave the upper notch of the auxiliary bolt 7c, whereupon the latter will be barred by the tumbler m. All the parts of the lock now take up a position to permit of the door beingopenedby pressing down one ofthe handles (l.

In order to prevent the main dead-bolt h andthe auxiliary dead-bolt `from executing any uncontrollable movements the inner face of the lock-cover is provided with the two leaf-springs 'a and e, of which the former acts upon the dead-bolt z, as indicated in dotted lines in Fig. 1, and the lat-ter upon the auxiliary bolt 7c, see Fig. 2.

For lockingA the door the manipulations describedabove will naturally succeed each other in the opposite direction.

It is evident that for door-locks intended to be lockedv from within or from without the dimensions of the upper and lower teeth arranged symmetrically to a plane which passes through the middle of the central toothvof both key-bits at right angles tothe therefore to be understood that, all such mi'-V nor changes may be made within the scope of my present invention.

l claim Y 1. A safety lock comprising a bolt having a pair of key-notches, a-slide movable at a right angle to the bolt andhaving a pair of key notches, a latch adapted to be engaged Y by the slide, and a key having a pair of facing and independently movable bits, one of said bits being adapted tosuccessively engage the first notches of the bolt and slide, while the other bit is adapted to successively engage the second notches of the bolt and slide.

2. A safety lock comprising a bolt, a slide movable at an angle thereto, a latch adapted to be engaged by the slide, a key having a iirst bit and a second independently movable bit that faces the irst bit, the iirst bit being adapted to start the bolt, the first and second bits being adapted to conjointly complete the movement of the bolt and start the slide while the second bit is adapted to completeV a curved slot, a slide movable atan angle to the bolt and having a pin adapted to engage said slot, a latch adapted to be engaged by the slide, tumblers engaging the bolt. andV slide, and a key having a pair of facing` and independently movable bits Vthat are adapted to operate said bolt and slide.

Signed byme at Barmen, Germany, this 4th day of December 1911. Y

HEINRICH WEGMANN. [n s] Witnesses:

HELEN NUFER, Y Y A. NUFER.

Copies, of. this patent may bepbtained for ve cents each, by addressingthe Commissioner of yatents, Washington, D. G. 

